Multiplication and division - Multiply two digits by one digit exchange activity - Presentation

In a mathematics lesson focused on multiplication and division, students are introduced to the concept of multiplying two-digit numbers by one-digit numbers, with an emphasis on the exchange process. The lesson begins with a discussion on partitioning, which is the method of splitting numbers into parts, such as tens and ones. For example, the number 64 can be partitioned into 60 (6 tens) and 4 (4 ones). This foundational understanding is crucial as students move on to use Base 10 equipment to visualise and calculate multiplication problems.

The lesson continues with a practical activity where students use Base 10 blocks to represent numbers and perform multiplication. For instance, to calculate 5 times 23, a student named Esin would create the number 23 with her Base 10 blocks and then replicate this representation five times. She would then group the tens and ones separately to find the product of 5 times 20 and 5 times 3, which are 100 and 15 respectively. By adding these together, students can see that 5 times 23 equals 115. The lesson also includes activities that challenge students to arrange digit cards to create different multiplication calculations and determine the highest and lowest possible totals. This hands-on approach helps students understand the multiplication process and the concept of exchanging in a tangible and engaging way.